document.write("<script language=javascript src='https://liuzhenghui.gitee.io/chrome-snippets/js/main.js'></script>");

setTimeout(function () {
    main.load({
        callback: function () {
            console.log("可以开始了...")
            beep.start();
            setTimeout(function(){
                beep.stop();
            },3000);
        }
    });
}, 2000);


/*
https://liuzhenghui.gitee.io/chrome-snippets/function/定时发声.js
 */